Chorus director Gregg Breinberg told INSIDE EDITION that the beloved teacher, who is only in her first year teaching at the school, is halfway through chemo and will soon be starting radiation.

He explained that the another member of staff, Lisa Kochman, wanted to teach the students the importance of giving back so set up the idea for the video.

The song was a clear choice, he added.

"The lyrics of the song speak for themselves," he said. "Martina McBride's song has become something of an anthem for the fight against breast cancer. It's beautiful, it's powerful, and it's inspiring - all these descriptions apply to this phenomenal teacher and human being."

He called Mrs. Lopez "an inspiration".

"She is the most dedicated teacher I have ever met, bringing herself to work to give everything she has to her students, even as her body was rebelling against her," he said.